Pentagon spokesman George Little told reporters Tuesday that the DoD believes there is classified information in the book. He said Bissonnette signed an agreement when he became a SEAL to have written materials reviewed by the Pentagon:

Well, this is for us pretty open and shut. This is a solemn obligation -- I've signed many secrecy agreements over the course of my career, working inside the intelligence community and in the Department of Defense, and it to me is quite incredible that someone invested with preserving our nation's secrets, particularly in very sensitive missions, didn't think to have this reviewed.

Bissonnette, 36, wrote the book under the pseudonym Mark Owens. Fox News revealed his true identity, based on anonymous sources, shortly after it was announced that the book was to be published.